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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da663f35806acddaf57c7c97fc002244701a8c72a720020d1a2bd1f436787bd4' 
  AND token = 'fI/6Wbwf6E0SGgbx3MEXCoOw5W5eYHLuiIos9UMielw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}